This patch comes from Gentoo:
 portage/media-gfx/prusaslicer/files/prusaslicer-2.5.0_rc1-fix-tests.patch

--- a/tests/fff_print/test_data.cpp
+++ b/tests/fff_print/test_data.cpp
@@ -4,10 +4,9 @@
 #include "libslic3r/GCodeReader.hpp"
 #include "libslic3r/Config.hpp"
 #include "libslic3r/Print.hpp"
-#include "libslic3r/Format/OBJ.hpp"
-#include "libslic3r/Format/STL.hpp"

 #include <cstdlib>
+#include <fstream>
 #include <string>

 #include <boost/nowide/cstdio.hpp>
